Machine for lapping wire drawing dies



May 17, 1949. 4 P. BIEBERICH 2,470,331

MACHINE FOR LAPPING WIRE DRAWING DIES Filed Dec. 15, 1945 s Sheets-Sheet 1 W INVENTOR.

May 17, 1949. P. BIEBERICH MACHINE FOR LAPPING WIRE DRAWING DIES 5 Sheets-Sheet 2 Filed Dec. 15, 1945 INVENTOR.

May 17, 1949. P. BIEBERICH 2,470,331

' MACHINE FOR LAPPING WIRE DRAWING DIES Filed Dec. 15, 1945 s Shee'ts-Sheet s W INVENTOR.

Patented May 17, 1949 UNITED STATES. PATENT OFFICE.

MACHINE FOR LAPPIlgG WIRE DRAWING DIE Paul Bieberich, Fort: Wayne, Ind.

Application December 15, 1945, Serial No. 635,260

4 Claims. I

This invention relates to improvements in machines for lapping wire drawing dies of the type wherein a refractory die body is enclosed in metal, forminga compact, and which has been pierced preparatory to a lapping or finishing operation as required to complete the die.

Machines ordinarily in use have lapping tools that are angularly rotated and axially reciprocated while the compact concurrent-1y is rotated upon its axis as well as tilted reciprocally during the lapping operation, or, the lapping tool is axially reciprocated and laterally swayed while the compact is revolved upon its axis, so that when the lapping operation is completed the ingross and egress openings through the compact are of conical form.

In the instant invention a wire under tension constitutes the lapping tool andis axially reciprocated through the pierced opening in the compact with selected angularity relative to the true axis of the compact which is concurrently rotated.

An object of the invention is to afford a machine in which a pierced compact is adjustably supported for rotation while the. lapping tool extends through its pierced. opening and is axially reciprocated therein at an initial predetermined angle, and with increased: angularity as selected by the operator.

Another object of the invention is to. provide in a lapping. machine of the character herein set forth, simple and conveniently accessible means by which to adiustably position the mount for the compact relative to. the lapping tool, and for adjustment of the: angularity of. the lappin tool.

A further object of the invention is to provide in the machine indicating means by which is definitely determined the extent of the departure of the compact and the lapping tool from normal alinement thereof after initial adjustment.

And a still further object of the invention is to arrange the mechanism, by which the lapping tool and the compact mount are adjustably supported, and the indicators, so the operator is enabled to accurately locate the lapping tool and the compact relative to each other to assure intersection of their axes at a definite point within the bore of the refractory die body and establish a predetermined divergence thereof, thus to obtain an intended taper of the ingress and egress openings ofthe die body upon com letion of the lapping operation.

Other objects and advantages of the invention appear in the following description.

An illustrative embodiment of the invention is 2v shown in the accompanying drawings, in which Fig. l is a fragmentary side elevational view of a machine in which the invention is incorporated;

Fig. 2, drawn to a reduced scale, is another side elevational View, the mount for the compact and its support being omitted;

Fig. 3. is a fragmentary front elevational view of the structure shown in Figand Fig. 4 is a detail view of a compact drawn to an enlarged scale, shown partially in vertical section.

The illustrative embodiment of the invention consists of a mechanicalstructure in which are included a supporting standard, a reciprocating frame having an adjustable guide-Way and provided with means to. support a wire under tension constituting a lapping tool, a rotatable mount for a die compact, actuatin means for the. mount and frame, adjusting means for the guide-way and the support for the mount, and indicators for the adjusting means.

The supporting standard preferably consists of a base 5 provided with an upstanding post 6 having secured upon its upper end a horizontal beam '7 in which is loosely secured tor turning movement. therein an adjusting screw 8, the threaded pendent end having thereon an arm 9 that is raised or lowered accordingly as the adjusting screw is turned. The arm has sliding movement on the post 6 and is provided with a uide pin 1 0 that extends loosely through the beam 1.

In the forward end portion of the beam I is mounted, for adjustably turning movement therein, a stub-shaft ll that is horizontally disposed. On one end of the stub-shaft is secured an elongated guide-way l2, and on its opposite end a threaded nut 13 by means of which when tightened the guide-way is secured in adjusted positions.

A frame, indicated generally by A, has a backbar I 4 that is mountedior. longitudinal slidin movement in the guidaway l2 and is provided with laterally extending parallel rigid arms l5, p ce part from each other, and on the outer ends of which are secured thev opposite ends of a lapping wire or tool I 6., by means of clamp-nutsv ll that are threaded on the. outer end extensions IQ of said arms. The arrangement is such that when the wire is drawn taut. and secured in place by the clamp-nuts, the, axis. of the wire extends parallel with the back-bar and intersects at right angles the axis of the stub-shaft I I.

The compact mount, indicated generally by- B, consists of a grooved pulley l9, preferably having ball bearings 20, and is provided with a concentric tubular chuck 2| in the top of which a die compact 22 is secured. The chuck may be of any suitable construction, preferably having a tapered portion that extends into the bore of the pulley, and provided at its lower end with a chuck-nut 23 that, when tightened, causes the upper end of the chuck to contract about the compact, thus securing it concentrically in place.

The mount is supported upon a horizontal bracket 24 for turning movement upon its axis relative thereto, the bracket being adjustably mounted in a fixture 25 which is supported on a stud 28 that projects laterally from the arm 9. The fixture is provided with set-screws 21 and 28 by which the bracket 24 and the fixture 25 are adjustably secured in definite positions. In this manner the operator is enabled to establish the mount in position so that its axis upon which it rotates is truly vertical and so the center of the die body corresponds with the intersection of the axes of the lapping wire l6 and the stub-shaft I I, or in the desired position for operation.

An indicator is provided by which is determined the vertical adjustment of the compact mount B. The indicator consists of a strip 29 bearing a graduated scale 30 that is secured on the arm 9 and overlaps one side of the beam 1 so that upon vertical adjustment of the arm 9, by turning the adjusting screw 8, the scale is concurrently moved relative to the beam and the extent of adjustments as made is readily determined. Another indicator is provided by which is determined the position of the guide-way,

which consists of a protector 31 secured on the outer end portion of the beam 1, disposed adjacent the upper end portion of the guide-way I2, and on which is made another graduated scale 32. The upper end of the guide-way is provided with an index l2 that is arranged to traverse the scale as the guide-way is swung upon its axis together with its supporting stub-shaft I I. By this means the operator is enabled to determine the slant of the lapping wire relative to the compact 22 positioned on the mount B.

The compact mount B preferably is activated by means of a belt 33 that is trained on the pulley I9 and connected with any suitable power transmitter (not shown), and the frame A is activated by any suitable mechanism, such as a lever 34, one end of which is pivoted to the lower end of the back-bar l4 and connected at its opposite end to a link 35 that is pivotally supported on the base 5. A midportion of the lever rests upon an eccentric 36 that is secured on a drive-shaft 31 mounted on a bracket 31 and is motivated through the medium of a drive pulley 38 and a belt 39 connected with any suitable power transmitter (not shown). A compression spring 34' is connected at its ends with the lever 34 and the base 5 by which contact between the lever and the eccentric is maintained.

The detail view (Fig. 4) illustrates an ordinary compact 22 in which a die body 43 is imbedded in a metallic encasement 41 having tapered axial openings 42 and 43 made therein to expose the corresponding polar extremities of the refractory die body which ordinarily is pierced preceding the lapping operation so as to permit insertion therethrough of the lapping wire or tool It.

Operation In using the invention a pierced compact is secured in the chuck, and by manipulating the adjusting screw 8, the mount is moved to a position so that the center of the die body in the compact is located approximately in line with the axis of the stub-shaft l I. Then by adjustment of ie bracket 2% the mount is positioned relative to the lapping tool It so the lapping tool intersects the axis of the stub-shaft II. The lapping wire preferably is of slightly smaller diameter than the pierced opening through the die body and is drawn taut and secured to the arms of the lie frame A and extends through the pierced opening of the compact and the tubular chuck. While the lapping wire is thus held, the mount is rotated and concurrently the jig frame is reciprocated. Then by adjustment of the guide-way, the jig frame is correspondingly moved to such selected position that the lapping wire travels through the pierced openin in the compact angularly with respect to the axis of the mount. Diamond dust or other abrasive material is then supplied to the compact through the ingress opening therein as in the usual practice, whereupon, the surrounding wall of the pierced opening through the die body is reduced'by the lapping tool augmented by the abrasive dust more or less dependent upon the a slant of the guide-Way and consequent divergence of the axis of the lapping tool with respect to that of the pierced. opening in the die body.

A feature of the invention is that when the lapping tool is initially positioned so that the axis thereof is perfectly alined with that of the pierced opening, the diameter of the lapping tool being slightly less than that of the pierced opening, moves freely through the opening without abrasion, and when the guideway is adjusted so that the lapping tool extends angularly through the pierced opening in the die body and consequently bears against the surrounding wall of the die body, abrasion thereof occurs more or less accordingly as the guide-way is adjusted.

By observation of the indicators, the operator is enabled readily to position the compact so that the center of the die body is stationed precisely at the intersection of its axis with that of the lappin tool.

By securing the guide-way for the jig frame at a definite angle from alinement with the axis of the mount, the taper of the ingress and egress openings of the die body are predetermined because the action of the lapping tool ceases to be effective when the wall of the bore in the die body has been reduced to correspondence with the predetermined angle. This is a valuable feature of the invention in that the abrasive action of the lapping tool becomes more or less ineffective as the wall surrounding the pierced opening in the die body is reduced.

Variations from the particular construction above disclosed may be resorted to bythe exercise of skill in the art, without departure from the spirit or scope of the invention.

What I claim is:

1. A lapping machine for wire drawing dies having a standard provided with a base therefor, a horizontal beam on said standard, an arm slidably movable on said standard provided with means for vertical adjustment thereof, a bracket adjustably connected with said arm, a tubular rotatable compact mount supported by said bracket, a guide-way supported in connection with said beam, adjustably movable upon an axis that intersects at right angles the axis of said mount, and provided with means for securing it in adjusted positions, a jig supporting a lapping wire under tension in a plane passing through the intersection of the axes of the guide-way and mount and having reciprocating movement in said guideway parallel with said wire, and mechanism for actuating the jig and mount.

2. A lapping machine for wire drawing dies consisting of a standard having a guide-way provided with means for securing said guide-way on the standard in selected slanting positions relative thereto, a supporting arm adjustably movable on said standard, a bracket adjustably supported on said arm, a rotatable tubular mount for a die compact supported by the bracket, a ji supported by said guide-way and provided with a lapping wire that extends through the pierced opening of a die compact positioned on said mount and has longitudinal reciprocating movement therein as the jig is activated, and activating means for said mount and jig.

3. A lapping machine for wire drawing dies consisting of a supporting member, a rotatable die mount havin supported connection with said member, means on said member for axially adjusting said mount, a guideway supported on said member provided with means for adjusting,

said guideway upon an axis that intersects at right angles the axis of said mount, a jig mounted in said guideway having longitudinal reciprocating movement therein, provided with a lapping wire that extends through the bore of a die compact supported on said mount and which extends in a plane parallel to that of the movement of said jig, and mechanism for activating the mount and said jig.

4. In a lapping machine for wire drawing dies, a supporting member, a rotatable die mount supported by said member provided with means for axial adjustment thereof, a guideway supported on said member adjustable upon an axis that intersects at right angles the axis of said mount, a jig having longitudinal movement in said guideway including a lapping wire that extends through the bore of a die compact on said mount, said wire normally extending in alinement with the bore of said compact, adjusting means for said guideway whereby to vary the angularity of said wire more or less with respect to the axis of said compact, and mechanism for activating the mount and said jig.

PAUL BIEBERICH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,760,406 Haddow May 27, 1930 1,885,178 Bsteh Nov. 1, 1932 1,922,497 Peterson et a1 Aug. 15, 1933 

